hostname for bash prompt

I noticed changing my hostname doesn't affect bash prompt under WSL, and I'm wondering if that can be changed --

I'ved changed:

sudo hostname wsl

I also changed /etc/hostname to "wsl" and changed /etc/hosts as well.

But my hostname in bash prompt never changed.

As per bash prompt user manual

\h
The hostname, up to the first ‘.’.

So I think, for normal case, it is read from either /etc/hostname or /etc/hosts.

Describe the solution you'd like

Any of the above changing of my hostname method can affect bash prompt.

For reason behind that, "I have 6 different wsl instances for different purposes. Most of the times I can't figure out which instance I'm currently in."

Describe alternatives you've considered

I know the official solution is to change the host system's name from System --> Change Settings --> Change, but I'd like to identify my WSL distribution in different sessions, e.g. UbuntuA, UbuntuB and UbuntuC.

Additional context

I know "WSL doesn't allow you to set a hostname separately from the computer".
and I know from #125 that "Changing the hostname from Bash is currently not supported"

but if you do a search on "WSL Change hostname", you can see that it is a common request, meaning most people have the same desire as this.

Please consider. thx!

The issue names no source files or tests. Start with the Bash prompt manual and prior issue #125, then investigate how WSL supplies the hostname to Bash; done requires a maintainer-defined approach for identifying separate distributions.